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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance For Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 11.2 $ 11.7 $ 12.6
Additions Charged to Costs and Expenses 8.2 8.5 8.8
Other Additions (Deductions) 0.0 0.0 0.0
Less Deductions 7.5 9.0 9.7
Balance at End of Year 11.9 11.2 11.7
Insurance Reserves [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 34.6 31.8 31.1
Additions Charged to Costs and Expenses 68.2 62.3 54.3
Other Additions (Deductions) 0.0 0.0 0.0
Less Deductions 63.8 59.5 53.6
Balance at End of Year $ 39.0 $ 34.6 $ 31.8